首 页机构概况机构设置科研人才队伍合作交流研究生教育博士后图书馆创新文化党群园地院重点实验室彭桓武中心信息公开
  学术活动
  您现在的位置:首页 > 学术活动 > 专题学术报告/Seminar
(Seminar) Current status of the first-row CKM unitarity
2019-01-30  【 】【打印】【关闭

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

Seminar

Title

题目

Current status of the first-row CKM unitarity

Speaker

报告人

Chien Yeah Seng  

Affiliation

所在单位

University of Bonn

Date

日期

2019年1月30日(周三)上午10:00

 

Venue

地点

Room 322, ITP MAIN BUILDING

Abstract

摘要

Precision tests of the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix set stringent constraints on the possible Beyond Standard Model (BSM) physics. Among others, the matrix element V_ud that is most precisely extracted from superallowed nuclear beta decays plays a dominant role in the unitarity test; however,  a precise determination of its value requires an accurate understanding of all higher-order Standard Model effects that enter the decay process. I will discuss a recent progress in the determination of the radiative correction (RC) in neutron and superallowed beta decay based on dispersion relation, which results in a reduction of the size of V_ud and leads to an apparent tension with the first-row CKM unitarity. I will also discuss possible future steps to resolve such controversy.

Contact Person

所内联系人

郭奉坤
IE6.0浏览器,1024X768分辨率 版权所有 (c) lovebet爱博体育官网
地址:北京市海淀区中关村东路55号 邮政编码:100190
京ICP备05002865号】 京公网安备1101080094号